mcuboot

Secure boot for 32-bit Microcontrollers!

Release Process

Version numbering

MCUboot uses semantic versioning, where version numbers
follow a MAJOR.MINOR.PATCH format with the following guidelines on
incremeting the numbers:

MAJOR version when you make incompatible API changes,

MINOR version when you add functionality in a backwards-compatible
manner, and

PATCH version when you make backwards-compatible bug fixes.

We add pre-release tags of the format MAJOR.MINOR.PATCH-rc1.

Release Notes

Before making a release, be sure to update the docs/release-notes.md
to describe the release. This should be a high-level description of
the changes, not a list of the git commits.

Release Candidates

Prior to each release, tags are made (see below) for at least one
release candidate (a.b.c-rc1, followed by a.b.c-rc2, etc, followed by
the official a.b.c release). The intent is to freeze the code for a
time, and allow testing to happen.

During the time between rc1 and the final release, the only changes
that should be merged into master are those to fix bugs found in the
rc.

Tagging and Release

To make a release, make sure your local repo is on the tip version by
fetching from origin. Typically, the releaser should create a branch
named after the particular release.

Create a commit on top of the branch that modifies the version number
in the top-level README.md, and create a commit, with just this
change, with a commit text similar to “Bump to version
a.b.c”. Having the version bump helps to make the releases
easier to find, as each release has a commit associated with it, and
not just a tag pointing to another commit.

Once this is done, the release should create a signed tag:

git tag -s va.b.c-rcn

with the appropriate tag name. The releaser will need to make sure
that git is configured to use the proper signing key, and that the
public key is signed by enough parties to be trusted.

At this point, the tag can be pushed to github to make the actual
release happen: